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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/ilm-shrink.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/ilm-shrink.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/ilm-shrink.html" rel="nofollow" target="_blank">../en/ilm-shrink.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<h2 class="title">
<a id="ilm-shrink"></a>Shrink<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/ilm/actions/ilm-shrink.asciidoc">edit</a><a class="xpack_tag" href="https://www.elastic.co/subscriptions"></a>
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<p>Phases allowed: warm</p>
<p>Sets an index to <a class="xref" href="index-modules.html#dynamic-index-settings" title="Dynamic index settings">read-only</a>
and shrinks it into a new index with fewer primary shards.
The name of the new index is of the form <code class="literal">shrink-&lt;original-index-name&gt;</code>.
For example, if the name of the source index is <em>logs</em>,
the name of the shrunken index is <em>shrink-logs</em>.</p>
<p>The shrink action allocates all primary shards of the index to one node so it
can call  the <a class="xref" href="indices-shrink-index.html" title="Shrink index API">Shrink API</a> to shrink the index.
After shrinking, it swaps aliases that point to the original index to the new shrunken index.</p>
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<p>If the shrink action is used on a <a class="xref" href="ccr-put-follow.html" title="Create follower API">follower index</a>,
policy execution waits until the leader index rolls over (or is
<a class="xref" href="skipping-rollover.html" title="Skip rollover">otherwise marked complete</a>),
then converts the follower index into a regular index with the
<a class="xref" href="ilm-actions.html#ilm-unfollow-action">the Unfollow action</a> before performing the shrink operation.</p>
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<a id="ilm-shrink-options"></a>Shrink options<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/ilm/actions/ilm-shrink.asciidoc">edit</a>
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<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">number_of_shards</code>
</span>
</dt>
<dd>
(Required, integer)
Number of shards to shrink to.
Must be a factor of the number of shards in the source index.
</dd>
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<a id="ilm-shrink-ex"></a>Example<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/ilm/actions/ilm-shrink.asciidoc">edit</a>
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<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT _ilm/policy/my_policy
{
  "policy": {
    "phases": {
      "warm": {
        "actions": {
          "shrink" : {
            "number_of_shards": 1
          }
        }
      }
    }
  }
}</pre>
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